Engine & DrivetrainEngines and Drivetrains can be a major problem for a lot of vehicles. If you are having engine or drivetrain problems, you can post your questions/concerns about the issue. Furthermore, if you are in the process of doing an engine rebuild, post your progress with pictures.
Replaced the pump and thermostat but it won't start.
Spark OK, timing OK, fuel OK, but compression is terrible: Dry compression: 60, 53, 30, 125.
I expect things won't improve much whe I do the wet compression test because this engine has 205,000 miles on it.
So I think I'll be either rebuilding it (machine shops doing the precision boring and me the reassembly or I'll be getting a Jasper or whatever engine.
The latter is interesting because there's a DOHC available.
What I don't kjnow is the price of the DOHC and whether it is a drop-in or a project.
I just want to make sure, You did hold the throttle open while doing the comp test?
How long has the motor sat before you did the comp test? IF it has sat for a week
or two the oil in the oil rings has leaked away and they work together to help seal the
pistons, so throw some oil in there and try again. If the numbers go way up but are still
low you may be able to get by with a honing and new rings!! may even be able to get
away with doing it right in the engine bay.
How long did you run it with no water flow?
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1991 Ford Probe LX 3.0 mtx
If you have intermittant running problems or a flat spot/buck/dying/cutting out while accelerating.
Do your self a favor and try some dedicated gas
line dryer, Double or even triple dose it, It's cheaper
then throwing parts at a problem that doesn't throw
codes!!
I think there was nominal oil on the rings/cylinder walls as the oil light went out.
Yes, the throttle was locked open during the test.
The difference between the numbers is the scary part.
I'm going to do a wet compression test next: An ounce or two of oil in the spark plug hole just before testing that cylinder. That should tell me how much bad ring(s) are contributing to the problem.
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to rebuild or not to rebuild 
Looking for advice. 
Linear Mode
